14. Install a bypass oil filtration kit.

The Amsoil version that we sell is a good fit here. This isn't so much for extended drain intervals since the 6.0 motor is known for shearing perfectly good 40 weight oil down to 30 weight by about the 5-6000 mile timeframe (this due to the around 4,000psi that the oil sees given the high pressure oil system). Rather, it's to save your injectors since they are SO incredibly particular about needing clean oil going through them. Stock filtration filters your oil down to 28 microns, which is pretty impressive until you realize that this setup will filter the oil down to two microns...

Of course, it would be a good idea to ship a sample of your oil off to a lab like Blackstone Laboratories just to be sure you can't score a longer interval next time you are draining at 5,000 miles, but don't count on it. The approximately $400 you spend on the kit will pay for itself in longer injector service life, the significant side benefit of longer bearing life, and the possible benefit of longer oil change intervals.